Use the Following Digraph to Answer Questions

Multiple Choice

Use the following digraph to answer Questions
Suppose that a crew can currently complete a job (order-requirement digraph is shown below) in a minimum amount of time.
-If Task T₂ is shortened from 9 minutes to 6 minutes, then what is the maximum amount of time by which the completion time of the entire job can be shortened?

A) It cannot be shortened
B) 1 minute
C) 2 minutes
D) 3 minutes